In the episode, Death uses the recently undead Torchwood team member Owen Harper (Burn Gorman) as a bridgehead to come through to Earth.
He also temporarily loses control of his body when his eyes turn black and he speaks in an unknown language.
Owen heads to a bar, where he discovers that his bodily processes have stopped, even though he still has electrical activity in the brain.
Owen fights Death, consuming its energy and forcing it back into the darkness, also restoring Martha to her original age.
He tells her "the man at the pearly gates" said to him, "You're a very naughty boy," which is a line from Monty Python's Life of Brian.
"[2] Digital Spy, on the other hand, praised the episode as "full of thrills and witty writing that is underpinned by a sublime, multi-layered performance from Burn Gorman.